/Engine/Source/Runtime/Core/Public/Misc/Fork.h
Performs low-level cross-platform actions that should happen immediately AFTER forking in the CHILD process in a well-specified order. Runs before any higher level code like calling into game-level constructs. E.g. notifies GMalloc to optimize for memory sharing across parent/child process
static void LowLevelPostForkChild ( uint16 ChildIndex )